The main arches of the innermost arcade (between the choir and its aisle) are, of course, much higher than the others. The space above them is occupied by an arcaded triforium, reaching to the springing of the main vault. This arcade consists of a series of trefoil-headed arches on detached shafts, with sculptured figures, more than life-size, standing in each division; in the spandrels above the arches are heads looking out from moulded circular openings, and above these again, small pointed arches are pierced, which have labels enriched with the nail-head ornament. The effect of the whole of this upper part of the design is unlike that of northern work, though the detail is all pure and good. The clerestory occupies the height of the vault, and consists of a row of lancets (there are five in the widest bay, and three in each of the five bays of the apse) rising gradually to the centre, with a small circular opening above them. The vaulting-ribs in the central division of the apse are chevroned, and, as will be seen on the plan, increased in number, this being the only portion of the early work in which any, beyond transverse and diagonal ribs, are introduced. There is a weakness and want of purpose about the treatment of this highest portion of the wall that seems to make it probable that the work, when it reached this height, had passed out of the hands of the original architect. It is strange that, so far as I have been able to learn, no record exists of the date of the consecration of the church; so that it is quite impossible to give, with certainty, the date at which any part of it had been finished and covered in. In the nave the original design (if it was ever completed) has been altered. There is now no trace of the original clerestory and triforium which are still seen in the choir; and in their place the outer aisle has fourteenth-century windows of six lights, with geometrical tracery, and the clerestory of the nave and transepts great windows, also of six lights, with very elaborate traceries. They have transomes (which in some degree preserve the recollection of the old structural divisions) at the level of the springing of the groining. The groining throughout the greater part of the church seems to be of the original thirteenth-century work, with ribs finely moulded, and vaulting cells slightly domical in section. The capitals of the columns are all set in the direction of the arches and ribs they carry, and their abaci and bases are all square in plan.